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Study on Asphalt Mixture Fatigue Threshold Based on the Design Idea of Long-Life Asphlat Pavement

Author: ZhuJianPing
Tutor: ZhangMinJiang
School: Shenyang University of construction
Course: Road and Railway Engineering
Keywords: Long-life asphalt pavement Design concept Asphalt mixture Fatigue threshold Fatigue life
CLC: U416.217
Type: Master's thesis
Year: 2011
Downloads: 119
Quote: 0
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Abstract


Joint scientific and technological project of this study, relying on the transportation industry, \A survey of the literature shows that the asphalt mixture fatigue threshold fatigue limit strain, theoretically there must clearly different asphalt mixtures fatigue threshold, structural design, long life, while existing fatigue life prediction The model does not accurately characterize the fatigue properties of asphalt mixture in small strain state, can not be directly deduced fatigue threshold. Therefore, the choice of reasonable fatigue threshold indicators research laboratory test methods for fatigue threshold, is the economic, a key prerequisite for the rational design of long-life asphalt pavement structure. Selection of AC-25 Experimental study of this article, ATB-25 and AC-20 three kinds of asphalt mixture AC-20 modified asphalt mixture. The mix gradation design principles as close to the actual engineering, mainly in the fatigue properties of mainly the molding fatigue specimen design porosity of 6%. The four point bending fatigue test, carried out for 15 ° C, 10Hz half being lost under the conditions of loading the waveform. Are respectively set different control strain, tested and obtained the corresponding fatigue life. The mix of road performance (dynamic stability, low-temperature flexural failure strain and freeze-thaw splitting residual strength ratio) indicators only as confirmatory indicators, to ensure that the engineering research mixes to meet the most universal adaptability. Analysis of domestic and international fatigue model based on the traditional fatigue equation introduced fatigue threshold parameters, to establish a sense of fatigue threshold parameter strain - fatigue life of the power function model. Three highway asphalt mixture fatigue threshold studies provide a theoretical basis for solving the corresponding fatigue threshold for long-life asphalt pavement design. Additional fatigue test and the low strain modulus of stiffness and fatigue life decay equations introduced epitaxial method a method to predict the fatigue life of the low strain, low strain fatigue life under the test conditions, and with the traditional The power function model and the three-parameter model of this study were analyzed. The study shows that the three-parameter strain - fatigue life power equation more representative and higher reliability to estimate the fatigue life of low strain region better. Fatigue threshold as design control indicators obtained in the present study, using the finite element software, currently two pavement typical structure of long-life design, and results show that the semi-rigid base and flexible base structure has a long life possible.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering > Road : use of the material points > Asphalt Pavement
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